@Charly posted:I have two loops, I power each off variable power, and two additional blocks powered by the fixed channels. They are my yard and my roundhouse. I am using two ZW transformers for power and isolate the two blocks by powering down the handles.
This is a RED FLAG! Unless I don't understand what you're saying, this isn't going to work well. You need to physically isolate the center rail feed from each TIU output.